Service a HuMa regulator for an Air Arms S400, S410, S510 etc XTX

This video shows you how to service your HuMa regulator for your Air Arms S400, S410, S510, Ultimate Sporter, TDR, HFT500 etc.
If in doubt please seek the advice of a professional if you are at all unsure or not competent, I will not be held responsible if you damage your rifle or yourself by trying to copy what I have shown in this video.